Dioxomolybdenum(VI) complexes with 2-((2-(pyridin-2-yl)hydrazono)methyl) phenol and its derivatives

Abstract

Dioxomolybdenum(VI) complexes having the general formula cis-[MoO 2(OMe)(L n)] (1-6) with the tridentate 2-((2-(pyridin-2-yl) hydrazono)methyl)phenol and its substituted derivatives (HL n, n = 1-6) have been synthesized. Elemental analysis and various spectroscopic (IR, UV-Vis, 1H NMR and fluorescence) measurements have been used for the characterization of the complexes. X-ray crystal structures of all the complexes, except for one, have been determined. In each of these analogous complexes, the metal centre is in a distorted octahedral N 2O 4 coordination sphere assembled by the meridionally spanning pyridine-N, azomethine-N and phenolate-O donor (L n) -, the methoxo-O and the two mutually cis oriented oxo groups. In the crystal, the complex molecules are involved in intermolecular N-H⋯O hydrogen bonding interactions involving the hydrazine NH and the metal coordinated methoxo-O. In four structures, discrete dimeric units are formed through a pair of reciprocal N-H⋯O hydrogen bonds, while N-H⋯O bridged molecules form a linear one-dimensional polymeric assembly in the fifth structure. © 2012 Elsevier Ltd. All rights reserved.